<style> 
  INPUT:checked + label {color: #00F;} 
</style>

<input id="theId" type="checkbox"><label for="theId"> The cat is here</label> 
<fieldset style="width:fit-content"><legend>Where is the Cat?</legend>
	<input id="cat_garden" name="cat_where" type="radio"><label for="cat_garden"> Garden</label> 
	<input id="cat_bed" name="cat_where" type="radio"><label for="cat_bed"> Bed</label> 
	<input id="cat_cushion" name="cat_where" type="radio"><label for="cat_cushion"> Cushion</label> 
</fieldset>

function save_test() {
    showloading();
 
    let AssessmentCategorie = []
    $("input[name='AssessmentCategorie[]']:checked").each(function () {
        AssessmentCategorie.push(parseInt($(this).val()));
    });

 $.post("ajax/save_test.php", {
     
        AssessmentCategorie: AssessmentCategorie,

    }, function (data) {

        $("#save_test").html(data);
        get_test();
        hide_loading();

    });
  
  }